何首乌的功效是（）

A．益肾健骨，软坚散结 

B．固精止带，补脾止泻，益肾养心 

C．养血补心，软坚散结 

D．滋阴潜阳，退热除蒸，软坚散结 

E．润燥滑肠，软坚散结

It was _____ several years ____ I had an opportunity of seeing the bird again .

A．for; before

B．not for ; that

C．for ; when

D．not for ; then